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4
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We are able to see through some objects but not others because different types of materials allow different amounts of light to __________ through them.
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5
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We are able to see an object that does not give off light when light shines on it. The object __________ the light into our eyes.
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6
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We can see a lighted candle in a dark room because it is a __________ of light.
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7
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One of the reasons why shadows are formed: Light travels in __________ lines.
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8
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The shadow of an object becomes __________if (i) the light source is moved further away from the object, (ii) the object is moved further away from the light source, or (iii) the screen is moved closer to the light source or object.
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1
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The other reason why shadows are formed: Light is partially or completely __________ by an object.
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2
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An object can form shadows of different __________ if the light source is shining at different parts of the object.
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3
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The size of the shadow of an object __________ if (i) the light source is moved closer to the object, (ii) the object is moved closer to the light source, or (iii) the screen is moved further away from the light source or object.
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